如何在画布上以所有大写字母绘制文本

Question

我正在绘制文本在我的使用和.但是，我希望我的文本以大写字母绘制。在线建议是使用，但该更改不会反映在画布上。CanvasTextPaintStaticLayouttoUpperCase()这是我的代码：public void createBitmapAndSave(ImageView img) {        BitmapDrawable bitmapDrawable = ((BitmapDrawable) img.getDrawable());        Bitmap bitmap = bitmapDrawable.getBitmap();        Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);        String topText = topTextView.getText().toString();        String bottomText = bottomTextView.getText().toString();        Canvas canvas = new Canvas(mutableBitmap);        TextPaint topPaint = new TextPaint();        TextPaint bottomPaint = new TextPaint();        Typeface typeface = getResources().getFont(R.font.impact);        topPaint.setColor(Color.WHITE);        topPaint.setStyle(Paint.Style.FILL);        topPaint.setTextSize(topTextView.getTextSize());        topPaint.setTypeface(typeface);        bottomPaint.setColor(Color.WHITE);        bottomPaint.setStyle(Paint.Style.FILL);        bottomPaint.setTextSize(bottomTextView.getTextSize());        bottomPaint.setTypeface(typeface);        float topTextMeasurement = topPaint.measureText(topText);        float bottomTextMeasurement = bottomPaint.measureText(bottomText);        StaticLayout topLayout = new StaticLayout(topText, topPaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER, 1.0f,                0.0f, false);        StaticLayout bottomLayout = new StaticLayout(bottomText, bottomPaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER,                1.0f, 0.0f, false);        topText.toUpperCase();        bottomText.toUpperCase();        canvas.translate(0,0);        topLayout.draw(canvas);        canvas.translate(0, canvas.getHeight() - 210);        bottomLayout.draw(canvas);        counter++;

Answer 1

toUpperCase()不修改原始字符串，而是创建并返回新字符串。你忽略了 的结果，这就是为什么它不适合你。toUpperCase()

替换为 。相同topText.toUpperCase();topText = topText.toUpperCase();bottomText